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*The Angi rating for Drywall Insulation companies in Bath, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Drywall Insulation needs.

*The HomeAdvisor rating for Drywall Insulation companies in Bath, ME is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Drywall Insulation needs.

Last update on May 19, 2025

Drywall Insulation questions, answered by experts

Yes, you can install drywall over plaster, but there are important factors to consider. While it can create a smooth, flat surface, it is often not the best approach. Installing drywall over plaster will increase the wall's thickness, which can cause issues with existing window and door frames that may no longer fit. You might also need to adjust power outlets to keep them accessible. A better, though more expensive, option is to remove the old plaster and lath entirely before installing new drywall. Drywalling directly over plaster seals in the old material, and if any problems arise later, you will need to remove both layers down to the structural beams for repairs. Given the potential complications, this job is best handled by professionals.

There are several things you should not do when installing drywall. Common mistakes include: adding too many screws, over-sanding, not adding backing support, and installing drywall unevenly. You also should avoid screwing into the same place twice, installing Sheetrock with tapered edges on the outside, and making too many joints.

You should leave a gap between drywall sheets because they naturally expand and contract along with the building framing as temperature and humidity change. Most pro drywall installers leave a gap of about ⅛ inch between drywall sheets, allowing the sheets to expand, contract, and shift without cracking or becoming damaged. If you don’t leave enough gaps between slabs, the edges will press against each other when they expand, and the pressure can cause visible cracks.

If you’re installing new drywall, you may need to skim coat the drywall first for a smooth finish and to allow the primer to adhere to the wall. It’s only necessary if there are imperfections in your drywall due to issues with the studs or improper drywall installation. If you’re refreshing existing walls, you may want to skim coat if there are imperfections across the wall. As an alternative, you can repair your drywall and sand it for a smooth finish before painting.

Water-damaged drywall should almost always be replaced. Not only does it look bad, it’s a breeding ground for toxic mold. Even if you think the area is dry and there’s no active leak, the only way to be sure is to cut out the damaged area and see for yourself.

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